rockchip: clk: rk3399: update driver for spl

Add ddr clock setting, add rockchip_get_pmucru API,
and enable of-platdata support.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Added rockchip tag and fix pmuclk_init() build warning:
Signed-off-by: Simon Glass <sjg@chromium.org>
5 files changed